- Arm I: Within 7 weeks after surgery or open biopsy, patients undergo radiotherapy 5 days a week for 6 weeks and receive oral temozolomide concurrently once daily for 6 weeks. Beginning 4 weeks after completion of concurrent chemoradiotherapy, patients receive adjuvant oral temozolomide once daily on days 1-5. Treatment with adjuvant temozolomide repeats every 28 days for up to 12 courses in the absence of disease progression and unacceptable toxicity.